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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eab85ca1c30b87e6a2a0025d7c6c82fa17b4551407017c5e2431b48f85e308c' 
  AND token = '90zf4ErCtNookFqm2jbmnNSHZiwrekIf/A1eToyXxiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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