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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98537e05a449c4bb03935a4c5c53bf68ce702dc3a09691010d2df930c0626c5' 
  AND token = 'oFWVfvA6KbQgS83eFzANrmYVuYyAGJwMVfZt2zb3ROc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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