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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef88fccbb4ebfaa29aefb3174742d6f50210ca3c90673135b38f55ef98bc1eb1' 
  AND token = 'hCutffaFwCkU+ax4nDGJH0pqU2tptwzN1mQ3/njqawM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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