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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c786ad1d68b422ab9bc01e772af26d7bfddfed4d85a659d2e195db9a15dacaf' 
  AND token = 'exSKxgqNnGLvvZiZGW10Kz3vx37S36qoAytb5OJev0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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