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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb48031a7069db4bb715f8777fd56e67da6d21a7d3651a9474f229f7fe237c5' 
  AND token = '3k1XF72z18iuocUaI8l+fbipfYtKrC/2pbEzXEOP/U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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