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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0317e82c6a4b2e86aae2161b982c62ca3c9f79456ff41ee523caad45356560' 
  AND token = 'LaGIfDbxRDuxInEJlo59Cxs0xwk2a4CjUdk5aeMk9QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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