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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4939a6d91f92489fa5a087b16725ca4c6bbca4562406158ece284436faee61e' 
  AND token = 'BQFh3iMM/ehX3dnicwMcihn81N30/IA7Ga2wllVAzVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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