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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95426cb186e0cdd45b2971aa9963d908313529675d8c475550a69248b91795fc' 
  AND token = '8RPZB3IEtPRC9HNEEiqp6dEKI6GaJFinu5vKlUsEMyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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