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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a46765cc4058c531eb11585f2d84d23ccd3f3c668e769ab4c7b3674f0f80eea' 
  AND token = 'qJk9eYSD5s9aL2sqP3uv1pEV8gdPYE0HqmsiS1elWns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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