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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a0bf1f31ef9f1110d26216659b0faddf3af7d8405fb4f59fcecd384fd431dfe' 
  AND token = 'hH0T9nHAwqpd7CeULz9MyIh6yWOnMzw+fh8Oog7jub8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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