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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766c911fe5e07fcd4f5accd4dbd81a69a83b9b0083e74892f9a99046ce2fe33a' 
  AND token = 'ZO4Z9F7MajXEX9wcEhJPb2CAMI7ftrsVT2lFJBvMPeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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