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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aba60e4db3a9de3cc0193d7434be3811d7ea884041eea553eca1665d9f5c27a' 
  AND token = 'aPMW/8owwl6frF4Bfzj2s7zZIwPWMfRoTPGDRUo8k9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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