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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1c3446442f30308aa71a3a70d2cf166576fd6dca59d758df265be5013eb454' 
  AND token = 'pJRxz7sv5MsGt777w/yATLwKXFp7pTpSKP/bzx7CoNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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