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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c3100628f099cb8c74aa6fcccfeb9ff3a77de4b986515e2c96f21457e214d0' 
  AND token = 'MIfDeHqgXym0xPt4apr9W+SQkn63k/A9+cI+zs7Bicc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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