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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019632a67fca49662814e21be943205910bac999a2eacac665b88154349c2fb6' 
  AND token = 'gnhpJ9HN883hrt+/WL6voZ/J2ubFwzgy7MJIPhu31TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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