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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da6d4d9e4a3937a5ca470d53a12d0327546e924de7eb71811e0716d9f4abb2f' 
  AND token = '8vgWycGqDwKj0RZORtCdRbdSrzEryst9gCXkwmm7Ce8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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