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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140f378142df9d34b2fca682e780844c71c7f1aa37f29f2157a07a9e7ab04a6d' 
  AND token = 'pnEjap0FlUHNgeJRxUgODRxoqsh0ovqdImdlA6k+5e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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