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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c6b12e966ac6c8dfae67c87ac6511a750d737dce8db961edd8224affea7abb' 
  AND token = 'XY7axgVUo76uxlMNUXVMxqCOtHRsQi5jj2na4LJ41ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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