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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb368de02d63210946f9be18ad68acfbedc62fbab706573f714924ae053e281' 
  AND token = '7WK4S/g0hUg8S67GVRDniky0kbrkQmlPrlM+BaIRrak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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