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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18276cebceb4be8723d08b5ae0ea6b7bc1e9a99281d68d7faf3110d6850ad509' 
  AND token = 'gSHGmhGtCdtxCPqoqOevR0L7MEx5e34PXc429vCPOoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}