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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4941ed06898f4c994132bbcf2ba09cfc455a7e12abd618ecdd70b536a0168a3d' 
  AND token = 'NHrqVkgtbeuF2wD+k3HL8YAS+uJyAzRoGr9mnXCAtjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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