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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec5c4f6cc59aeb7f2975c40e25893ee30e4e0b5bf23c5ddb4007161e0efd50b' 
  AND token = 'fnj1cjY5Ad2NeEhTq3VmJp1s0AZ6pqf0N9k94wYFjJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01357

JSON explain

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