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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e58c81c081dbb2114899a258d583a12e0941cbb2de0f28a11760af87ffa9b0' 
  AND token = 'bMSEjuojmutqe21WoxTQ+fX5vQ6JHFN63YAZxFsPp/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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