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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81cad2a77c2cd27e92ccc3b05d62c61060ff88b64f52b3f5c9a04ec5e843d827' 
  AND token = '3IEGkeqORXuOct0uoiQFaBFN3X4od+2jpWyBqw62xhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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