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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cddc6528bc3650735492576e8e19ad59cf311905b61f210207022e11817c38' 
  AND token = 'dRR8ji8Khy3i7SM6IcgyVz9ZmgeLngRb7h8N99ahHOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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