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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936d2c2f0e6766b80999942f4d4fd15cc6db2bf373c7d7c62a8f67f21cab945a' 
  AND token = '6HCFxBxBctWNBiJoMUO095XuMSEvo1HV7e+jJKlOub0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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