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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9d8ab0c429fea3bd4fac7b1d5b5234048fb6fb8ba20e19c74490d2b147434a' 
  AND token = 'RsIHhkIRmulpKdqI9JmcrUL4wLhC7rUoyEUt0QG8NK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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