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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2a413a61d8baa04cec65eb5b4b2843026b88145313b7861bd57b2047022d8b' 
  AND token = '8vmADS5ukvDbG4luAEhCovH42t6Ldwi570VvxoLBpx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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