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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676a37e4dd5ab951815dd8560bd02a7e50b0fa8512e22cb9082387266b1b2e4b' 
  AND token = '/cJMDZCdeM1zsuhc029TCm+aRhZZ04aHZ0+LcckLXB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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