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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61629c926a7908411c35cae5d609fbe9c7f7267ed6c99c08b9c74880ba4bc6b1' 
  AND token = 'Bc/P76rhs54PEPgKj3D21lwvmjFIDP6JlNGFwj7axOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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