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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ab8244c8ee05eab2e172a2f0b6341927c96acef0c2a7a506f8894e3b95d2a7' 
  AND token = 'lvj14JoG93hWVJcXs7ixjqrN32f0Y0P+MXLTqHM+juI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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