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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcac071798a81f55144ce7b5c02e57a40a8a2a89885788205f154c06d0843660' 
  AND token = 'jYbhIDmVIGOg5gQJkdyyq36NXrBjQq0JQWkVEJJQxiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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