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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffe22c8e2427d1e74b4520ea14fa216230b723d91ceb0d554a266a073588797' 
  AND token = 'BmeT4PAYdjoVJwZD6hdNKpPrDOF6AY9nXidLHrYQe8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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