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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2918f27644bd5638c229373be4159d6a313aa0c4077acdf997bee087831f3791' 
  AND token = 'IYQKOnEbeI9Z0Q3Fpbc/nbi03m27ry0TykO/1ZJuEIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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