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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa73c2fbe527db4b02937f2e44c91a46e3006acf90574fafd8a32b24bbee0e8' 
  AND token = 'CI1g4Z6VLcwpdCmAqDXgWk5+LeOsSwe9GVMwH2Oeze4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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