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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a862d3b03a113e43cbe8c8c3ec82d2805e2e11f7133a7c3bc4c4827bc591f89' 
  AND token = 'a5ft2I6wGwH+SWoMED6D/doRqbfbR6UO1kJ1hQLifOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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