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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71201a77f5a43c98c9ad0cbeefc669782d5e929737ee6f9a5a5499b60cc9dba3' 
  AND token = 'It6swDq/StzHNjrIkcVUH5GcNj70bqqcHHBdr4+/P+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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