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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c19e500c17589bdf5f51dd8d01168c76e51d8fc9c88e011c3baa6169e783a2d' 
  AND token = 'Ikzdr8se/onWLcLCSIUioRLiwJEFaJWMjVoREY3dXSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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