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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61484063238f16a269e4ed1f5129c4a61845b86d9c1dda13c959602e3873ff8e' 
  AND token = 'tzjt41BR5QsYmWCuv/dAkJbCnp32/j6Uz2F5vlAa1p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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