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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149737c65c2c8aa5505aa54d939c6f9677fec754daf1857a1685905a5ef26ea6' 
  AND token = 'mo7PE55A7tQEwWduxz+80BkyQ8IdJLA0fTQk8p1uVU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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