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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc921100ff3f00b15c0bb3b04080efabf766f7870cde4fcef14d3cf1541d8ba' 
  AND token = '1/JW22KWLBr+UkNJa3J4Ad1YrLZ7bCPA7Rq/2dkRnPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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