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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27935adfc5d83997975d6d9b9613cced49471605880b57c92727809b41ecc06d' 
  AND token = 'eGIx4cgxZSBuX/MjPobtXwZCuU0ka2ZV67vq782Tp3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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