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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3315b7d88467860afc47bc5cd84eba1e7c088c6c4670ebc761596e99c9c7f57d' 
  AND token = 'cvYdaAN/cNApZs4IrHX8z+gOwvPtb3X6FIOICXoG8WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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