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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec176c7d1f146712048a34d29110fd280aab1d35fce24918a2043d5cfd663ef' 
  AND token = 'Ys4M97UxWFAOik3egAf7IkXckPpYYkmaS617ZA+NLgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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