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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e136fb61ddb178dd92e866e96ab8af29e596cde10d01177674bb6983505a75' 
  AND token = 'hv9f/9cOjYWdW9NNs/dXYxa0aU68/kHf9+dWSszLfBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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