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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb9256864ebf5afebcf281e2944b96aeb4e0421a9b2bc04c1c4e2ff5632d2d3' 
  AND token = 'HbgH4HPiOEKcahiaSx6V7z8q5XYl72bF1lUmXw6+8zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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