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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5a8130a51f5ce0b9f747a5244774bae1fb2b4a4c4ee12221a1805949d3cd3d' 
  AND token = 'zKfAN0TjwCznLEVvv83q05mcAVzdLxaurhMkhGF1II4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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