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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef8702e6fa74c1c547627e755c803c42bdbd32545f622ae64571d13770d1033' 
  AND token = '9PPcN2YPkBPU9La8+YjEb613fNYcvE+TEt18BL+EC50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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