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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7562eea9d57520362a6df5c9ec440584064e3bed61de4f0221fad5e72ff7fa21' 
  AND token = 'xYG2olmff4vx747W80jUoPaQJBYNFB6WJkIE+sQIG70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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