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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afc2069b095b57c4e5a6ce9e5ae7ed6db136ebe6dc5bc2f17406af76602fea5' 
  AND token = 'Kj/IRr+4Ik2/R7QnSU6RbyUF34TuNF+KdeHRWUAPQ4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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