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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283b614af07ed2b7359e53a86a79cf9e66c2b8b54852a4ac384f4606520b032f' 
  AND token = 'FQ70dsH5ei2/dzVP/ml17tmlNH5Sx4Cx+3ZfhVJfiBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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