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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276c7c9cf98f35f9ce9184c8464af7a3a7e8590dba2eac6cbc04822635547134' 
  AND token = 't+Ijw9KVeGZm+idAWxnnXmrYVCrKusxk6IToIcRSuXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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