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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b43be72996b3d15c825a97fba0864a659844da939929f837ecb94326860760d' 
  AND token = 'jRqJ6EbT39FU2NUmPwBVsbVxP8oVYpDfUlDjZeyckI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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