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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937beebcc8a65be9d67814a56be39dfb84951c4d19b369f1ace985fbd97bc9c5' 
  AND token = 'NlvL8inUXb4a6f9BkEGJpcNkhNjuzsZYr2I+NbbcbQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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