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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f933d19d8bcaf72a08595a244df1efd28d940aad06bee1cad85a09e44c36a57d' 
  AND token = '+liHN5J8t3G1BQais1Mi36B8xlyvfLJGKN6iYICVp7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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