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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470483082d5c7458d73698279403d69bad588b364bbe0c1fe93e9179fc4e4c24' 
  AND token = 'Z4KpmMbTimOkn9U9R3G9VlAENtrJWbTzBQWhPC4/iC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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