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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099cdf3275928e66b273dee254e2fa3ccf7e6c4044c37ecedff17e5d411b4ef6' 
  AND token = 'VMgtwhiULtTIwxnNFeQcsEFZ+zK3yU0Pf0moSqgA25w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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