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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db898f73aff0bd29fd096a5b7547c9cc3a40ce37dca8d2d6138a9ca457090ba' 
  AND token = 'AGhPG+KE9VK/XpEFNIWlVFRqpMvPr+KkazVz+NaINDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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