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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce350d4806bc5801f847782a0ab2bfc261d2b564bb64d4db9da157c5df825a8' 
  AND token = 'IJE3tiqSrzAvVhpO9kHMFoF96DfnXbAc1JFf49fluMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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