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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40e697879b14bb4b1859f1a00f0c47d940da80c2a13a52f5da89e3dd6d69a5a' 
  AND token = 'eGja43IiFb2wgGPpXRnMA7Cnsg+Z7R+tWmZ4QogIMBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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